<div class="panel panel-primary">
  <div class="panel-heading">NgFor的用法</div>
  <div class="panel-body">
    <p>ngModel只能够用在表单元素上</p>
    <input [(ngModel)] = "crrrentRace.name">
    <p>{{crrrentRace.name}}</p>
  </div>
</div>